"Smart" watchdog safety switch

Details "Smart" watchdog safety switch "Smart" watchdog safety switch

1989-05-12

1991-10-01

Atkinson, Charles E.

Excavating

371 14, 371 62, G06F 1100

Patent

active

050540238

ABSTRACT:
A method and apparatus for monitoring a process having a periodic output so that the process equipment is not damaged in the event of a controller failure, comprising a low-pass and peak clipping filter, an event detector that generates an event pulse for each valid change in magnitude of the filtered periodic output, a timing pulse generator, a counter that increments upon receipt of any timing pulse and resets to zero on receipt of any event pulse, an alarm that alerts when the count reaches some preselected total count, and a set of relays that opens to stop power to process equipment. An interface module can be added to allow the switch to accept a variety of periodic output signals.

REFERENCES:
patent: 4109234 (1978-08-01), Davis
patent: 4110687 (1978-08-01), Sneed, Jr.
patent: 4405982 (1983-09-01), Ruhnau et al.
patent: 4434403 (1984-02-01), Chang
patent: 4538273 (1985-08-01), Lasser
patent: 4586180 (1986-04-01), Anders et al.
patent: 4611295 (1986-09-01), Fowler
patent: 4745542 (1988-05-01), Baba et al.
patent: 4809280 (1989-02-01), Shonaka

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